Fan and fan blade



y 1937. L. B. SANTMYER FAN AND FAN BLADE Filed Sept. 8, 1952 a fan by theuse ly em odying the in ure 3 the blade l6 I paddle with a relatively long curved cutting edge curved till "Patented May 4, i937 ,UNITEDSSVTATES PATENT OFFICE ranannmnn ann 7 Lewis B. Santmyer,

one-third to Pittsburgh,- Pa Joseph A. Beck, Pittsburgh, Pa.

assignor of I Application September a, 1932. Serial No. 32.204

relates to motor driven fans fined by the tip oi the, blade when-rotating. Another object is'to of but a single blade.

The herein disclosed embodiment illustrates a practical means'oi reducing the invention to 20 I practice. In the drawing Figure l is a front elevation tion. 7 Figure 2 is a-sideel vationj thereof with the support annulus in section. v

e 3 is a front elevation of tin-alternative ,iorm oi blad Figure 4 is a section through the blade pf Fig. 1 at a right angle to its radial axis.

Figure 5 is a section through the counterweight at'a right angle to'its radial axis. .7 ror pui'po es of illustration the fan is shown of a tan central brace l3. The fan motor I thusprovided and I provided with a streamlined .terweight portionl'll. 1 5

In the alternative embodirn'ent'shown'in Figis shaped- -ll' and asimilarly curved trailing edge l8 and is. This blade is al'soprovidd with a streamlined counterweight 'tional two blade two trailing edges, and the other a single blade.

increase the emciency of put to'produce this edge and one trailing edge in a circle the blade tip when the blade is rotating.

. circle defined by rotation.

and co ly greater than the radius of a circle defined by. L the tip of the blade when rotating. I

a single integral one and cpunter-weight mounted there-- 7 "piece blade substantially as a portion 20'. v The particular shape of blade is immaterial so 9 Claims. (Q1. INF-159) long as there is but one cutting edge and but one trailing edge within the blade when in rotation.

Numerous tests have been conducted with two types of twenty six inch fans, one the conventype with two cutting edges and type made by taking the identical conventional two blade type removing one of the blades and properly counterbalancing to form same into a single blade, with one cutting edge and one trailing edge in accordance with my invention, the diameter 01' the fan circlebeing the same.

Tests for H. P. input and air delivery weretaken and showed that the same H. P. consumed in driving the two blade fan would drive a sin: gle blade fan and produce about one-third more cubic feet or air. 7

. The two blade type fan produced approximately thirty-five per cent more cubic feet of air the circle defined by than the single blade fan but required about one 7 hundred and ten per cent increase in H. P. in-

additional thirty-five per cent cubic feet 01' air.

By the g 1. A rotary fan blade having only one cutting 2 In trim, a. rotatable unit, and a single blade attached to said unit for rotation therewith, said blade having only one cutting edge and only one of the blade when in rotation.

practice 01' this invention a material reduction in trailing edge within the area defined by the tip 3. A fan comprising a support, a motor carried thereby, a shaft cutting edge and driven iromsaid motor, and

one trailing edge within the the ti of the blade when in -4. A fan, blade comprising an anon section unterweight having atotal length slight- 5. In a i'an;a driven shaft,

on to turn therewith.

6. In a fan, a blade and a counter-weight therefor, said counter-weight being streamlined.

7. A fan blade and a counter-weight integral therewith. said counter-weight being streamsaid shaft presenting only one 10 of the blade when rotating.

airfoil 9. In a fan, a motor, a shaft dri en from said motor, a single blade mounted on said shaft, said blade having but one leading edge and but one trailing edge within a circle defined by the tip of the blade when rotating, and a counterweight therefor, said counterweight being streamlined.

LEWIS B. SANIMYER. 

